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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab93299d737d51f0b3eba772731ab5949754492004fb28428e5a62f4787eb5d7' 
  AND token = '58eGuxez8KVowdSlgQGtPGj+/6daOUkbiS4mHUW5I4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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