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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6945be0f5f5c56cc0d4abadae861fda64e1a42325af7f024e5c7c371a18c2e' 
  AND token = 'gsi5qZNBJ9tu6vn5hsT367u8cF29uB7uymEKiz7zasY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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