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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75ae0cb7de6dfa992dec3aeaf28a3dcc626900b0a78611b8619ee7220c7b584c' 
  AND token = 'ds7YfQrj/c37nDHFA6GG/yBr7ptSbf9ubgA3vRf/VEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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