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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e50f894fa0ba1c947f49ddec09373b7c16e0c48be5d46517c6f460abff64d89' 
  AND token = 'NNwEtVM1sJvmHNcRDox3XEHDXhfCuZ3rxpDJPeA73fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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