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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592cab378f780a8a93a5435dc7c578afde7789e8c59c0f5eecffaa4c439169a3' 
  AND token = 'LtgQ8JlBJC+it6cQmTxr0/dRSAetO/raLYRUITDS2fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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