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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30174d05d5b0e83a97e33604027c9a484946b9357175b36eb321ed9c73221f53' 
  AND token = 'BHgohJ5o/w8x+1pnkxvclkNo/x75QUgAhIS1N0u85NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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