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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56919b27556201abdf6ef2c18984b8f2c1f5a5e1edb019f777779b8f6ac92945' 
  AND token = '86cSZZjCRjemY5VMpnZVrc1e+8IuZf1z3vwu626Vo9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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