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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e2113fa932c193cd9a7cd82e1a0c22562919cd21124d9604c6c73877a934d4' 
  AND token = 'GF1ZnMCrFatocr8Vw/redG9yJGFc/EJnbk3kaaoy7Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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