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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0696f807470e6a119f2af8e4e878d742bcde374a766f2cd1bc4a7f678f565e9c' 
  AND token = 'YW/pCOxi8y9KWs3A//dCBw3XXJYCiho0TUrlpoq6KU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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