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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07255341244678dbab382d447e7b8e632c774c998e33c91155e1e05f14ed77cb' 
  AND token = 'XTI7J2rs8Ufa6C3E9fnW8NjzsW8SfJ3BgdR2iQdO1vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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