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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d9032465e9b22f48779167f760bf5c35be91594fe5ed0b0c18a63c50c4f0b3' 
  AND token = '5NbB7JUXx93x9ih7xgs9FApZn1YtBEvP73uEaUQkfjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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