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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a6a00aadc4bb394db74312bbd50fea2c1afd2a1d2ba6005e569f1cbcab2e1d' 
  AND token = 'UK9nCEtTade1DlF6nqqflB/aQNl2iph4A0Bf385xCRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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