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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5470e60ae89ce5b8e12f6d31c26fdac89b2514e82dac9acafdd75e7e77d46e9' 
  AND token = 'j+OP1seHKKbs43og+oNL9AIV6Ps7OuYfLf22rRfiqbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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