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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2740faed38d47ac413748a6ca7aada0229d75a40f33e902e07e9044dd84bc558' 
  AND token = 'SxuERbgZVWytuXI+Izz83incupUMT2P9V6S0We/+eNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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