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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5b5a8701790fe15d6bb9e73029866f8d55aa388e50c6be10db663a40186067' 
  AND token = 'XPXGKdkUPC9JUV4ahjzhyP5u/8iplRbQD92VQne3KAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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