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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d67b1706b18cea284d74c7e79f3023bda2cd2285d196e321031a6569b8dab0b' 
  AND token = '6TYluQPiIQ4F0gR2JXUvjtf7CWn4EPFB1raWCC/sYPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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