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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a988afc80e0bdfe77dca5a6ae40515e60c22be44a3f2b53f47815cb41c7b00a8' 
  AND token = 'E7EYLohFb68I3XlwAv3S1+85NMtqApSJtQtX1q9vU7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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