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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98340139d755b364cbd01854b9618457d8e5c3677529f03e44a38694a6b05e4' 
  AND token = 'MLzmwNuPF91y9WseR+qlsVqSvkMSk++rsqcLcl2CNWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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