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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1950b44789540a13cda8522b79b2012cc0720823567442fe7af26a0de913a388' 
  AND token = 'jFK2jG+Akm2yRN54eYCfP4rUAo3DvDsiSEna+BxNAYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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