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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6025638fb91f9002e30b125ba5218e9982d57c9b6cde802fe8112ef85b487f53' 
  AND token = 'NF/D00i0KqaO1/O8rAH2W3ZYBsh6stKIZYhU4lGQ8Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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