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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d089657d360d81c051cf0b30dc62dcbd4c7c136c643346c1fac478e11e5dd7d' 
  AND token = 'SOH2Mi4OvxP7ubq/phC//ioZniKm4uo/RpEPqQ3ytpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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