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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9714a9857c917690631cf5f8500a0893aa4351fbcc1d10c2e515348abd9308d0' 
  AND token = '9lEihQhtDV0uXqAOaxmCke1n1xaV4WuEcaLR6uey4CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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