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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9319ad331b6214e75edce2cc6badc0749851c052b17eee0af6b1e9621dc16c8' 
  AND token = 'cIkWT5gMdn7NjDwLLjeHQVFF/oI8a83wWwfkJ2I/2zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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