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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec1ea1efa9acaa4e9a196f991f6f314c6bb4fcb860ad4f3eb5d40cc78a72765e' 
  AND token = 'jEZTQjQd5Ry5LUIizTnFzvJ30ywRZ1p5sBW3Gks41vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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