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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3717cfa364b2ba5fe5738b124dd74a41580b7edbf726402e17be6fe232c7af5' 
  AND token = 'T0zzi7alJwlVgEfkufwW8IdRXPv5GzASy9IdBPINH3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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