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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1e8bb5cd895f36366de08dcdfd82d7a8d12cc7d4b0d0b995bb06d52d25d51b' 
  AND token = 'fSl3yRMN4BR//M0Kn9aYriQzu1Ncsq9DPyxYbDapF/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}