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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0efc777aebbcfaee1c912b594a988a2152b8e40279bc40ad1c67e54f8a2b5787' 
  AND token = 'VAbpDjVsL3BxpI0CB7koqsULbBHHUgtgdHUrG9dnN1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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