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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2955117384668d4169f13bea7b242226785bf7c988a3fa4d999d3edae9ec6583' 
  AND token = 'H2tvsRe7OjIGSlmGJdM0W6BK1LJ+H0Ds2iJf+oL4kdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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