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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074f8a7e7997c64e475d6de2da91e249124d94256ea1fc09ff2ef39962e3e7f2' 
  AND token = '+gWtx3mz1IDqvHomWCUhYHOOHuZG51eafNETQb2NhlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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