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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7dab62991180b6e4199053c4355141f0cb5c3bfe6f10868e7b4fcb325dac56' 
  AND token = 'EV8ToCssqjUSKH5oU1aD7VdODP/lPRDti4+EAD01VVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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