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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bcea0968e112c8198095f5dd49e23e0c4fa4f6c640dec556e9992f621cb2be' 
  AND token = 'mtyDiC0pROOJ21a+1LSLqC71LqvliupxBs5TIOOhUq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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