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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08131d7de4b129fa8f43f87a30474ca52debc9e185df58ce83081b2635bb4d7' 
  AND token = 'FXn2wu5RF+AyoUmkj7PEYGxJ/yANig2ikEMA5myRb7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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