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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4031ae8407c764a65acc85ce0dff840732c9714fa02d548af4dd319e3d5265' 
  AND token = 'k6WEGZ3CvnbLPG1BA5ykgmF9YND6L3j02M8PcARChHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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