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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a6711d9c17e44f67e8b53c417bd98c84350876d4c994af8abdc066a8b132c2' 
  AND token = 'IaGDefh0dU8JCPqrCdcDJR7HBJkRJ9OWejiA87h7Nrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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