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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6a58970a50e23f50123ca0a67e6b4d02ea7abeb60ab474b1f8a25bb8b01ec1' 
  AND token = '+qWjadOHbJA7qAVSWoi70GjE9i7G67cMwm06FHAplRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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