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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e80f1f30ce951e40941304d9715142f67cb7379d13fa790c1d102b4d6fede4' 
  AND token = 'q7kZ/hVyShaKFBq9Uo1rBeoMiDFchFFN5hvumbFPF+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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